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Preparation method of micro-capsule fly ash floating bead toughened and reinforced phenolic foam

A technology of fly ash floating beads and phenolic foam is applied in the field of foam materials, which can solve the problems of high brittleness and low strength of phenolic foam, and achieve the effects of improving impact strength, improving compressive strength and good toughness.

Active Publication Date: 2014-10-08
HEFEI GENIUS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of low strength and high brittleness of phenolic foam. The present invention provides a preparation method of polyurethane prepolymer-wrapped fly ash floating beads to toughen and strengthen phenolic foam

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Prepare polyurethane prepolymer: add 20g PEG-200 and 50ml tetrahydrofuran solution to the solution of 69.6gTDI and 100ml tetrahydrofuran, heat up to 60 o C was stirred for 6h, and the solvent was removed under reduced pressure to obtain a polyurethane prepolymer.

[0031] Preparation of microcapsule fly ash floating beads: add 2g of gelatin to 100g of modified fly ash floating beads, then add 10g of polyurethane prepolymer, adjust the pH to 8 with NaOH solution, at 80 o C insulation for 0.5h, drying to obtain polyurethane-coated fly ash floating beads.

[0032] Preparation of phenolic foam: Add 5g of the above-mentioned microcapsule fly ash floating beads to 100g of resole phenolic resin, stir at high speed to obtain a uniform mixture, then add 3g of silicone oil, 9g of pentane, and then add p-toluenesulfonic acid, water and phosphoric acid. 10g of the mixed solution (the mass ratio of p-toluenesulfonic acid, water and phosphoric acid is 2:2:1, the same below), stir vi...

Embodiment 2

[0035] Preparation of polyurethane prepolymer: Add 60g PEG-600 and 50ml THF solution to 69.6g TDI and 100ml THF solution, heat up to 70 o C was stirred for 7h, and the solvent was removed under reduced pressure to obtain a polyurethane prepolymer.

[0036] Preparation of microcapsule fly ash floating beads: add 2g gelatin to 100g modified fly ash floating beads, then add 20g polyurethane prepolymer, adjust the pH to 8 with NaOH solution, at 80 o C insulation 1h, dry to obtain the polyurethane coated fly ash floating beads.

[0037] Preparation of phenolic foam: Add 10g of the above-mentioned microcapsule fly ash floating beads to 100g of resole phenolic resin, stir at high speed to obtain a uniform mixture, then add 4g of silicone oil, 10g of pentane, and then add p-toluenesulfonic acid, water and phosphoric acid. 12g of the mixed solution was poured into the mould, after vigorously stirring evenly, at 70 o C foaming and solidification molding to obtain toughened and strengt...

Embodiment 3

[0040] Preparation of polyurethane prepolymer: Add 100g PEG-1000 and 50ml THF solution to 69.6g TDI and 100ml THF solution, heat up to 70 o C was stirred for 7h, and the solvent was removed under reduced pressure to obtain a polyurethane prepolymer.

[0041] Preparation of microcapsule fly ash floating beads: add 3 g of gelatin to 100 g of modified fly ash floating beads, then add 30 g of polyurethane prepolymer, adjust the pH to 9 with NaOH solution, and adjust the pH to 9 at 80 o C heat preservation 2h, dry and obtain the fly ash floating beads coated with polyurethane.

[0042] Preparation of phenolic foam: Add 20g of the above-mentioned microcapsule fly ash floating beads to 100g of resole phenolic resin, stir at high speed to obtain a uniform mixture, then add 4g of silicone oil, 10g of pentane, and then add p-toluenesulfonic acid, water and phosphoric acid. 12g of the mixed solution was poured into the mould, after stirring vigorously, at 80 o C foaming and solidificat...

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Abstract

The invention discloses a preparation method of micro-capsule fly ash floating bead toughened and reinforced phenolic foam. The method comprises the following steps: treating a fly ash floating bead by using a silane coupling agent, and then wrapping the fly ash floating bead by using a polyurethane prepolymer to obtain a micro-capsule fly ash floating bead; then performing foaming reaction with raw materials such as A-stage phenolic resin, a surfactant, a foaming agent and a catalyst to obtain the toughened and reinforced phenolic foam. The surface of the prepared micro-capsule fly ash floating bead disclosed by the invention contains relatively more isocyanate active groups, thus the micro-capsule fly ash floating bead can be used for reacting with matrix resin in the foaming process to improve the compatibility with the phenolic foam; the micro-capsule fly ash floating bead has an reinforcement effect on the phenolic foam; the introduction of flexible long chains in the polyurethane prepolymer can be used for improving a friable structure of the phenolic foam and improving the toughness, and only can influence the excellent combustion characteristics of the phenolic foam to the lowest extent.

Description

technical field [0001] The invention belongs to the technical field of foaming materials, and in particular relates to a preparation method of microcapsule fly ash floating beads to toughen and strengthen phenolic foam. [0002] Background technique [0003] Compared with other widely used building insulation materials such as polystyrene, polyvinyl chloride, polyurethane foam, etc., phenolic foam has good heat resistance, is not easy to burn, has less smoke, and has high fire safety performance. Low smoke and excellent flame retardant properties have great value in construction as a safe thermal insulation material. It can be seen that phenolic foam will be more widely used as an ideal thermal insulation material in the construction industry. However, phenolic foam has high brittleness, low strength, and poor mechanical properties, so it is difficult to meet the requirements of on-site construction and industrial development. [0004] Fly ash floating beads are thin-wall...

Claims

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Application Information

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IPC IPC(8): C08L61/06C08K9/10C08K9/06C08K7/18C08J9/14C08G18/76C08G18/48
Inventor 杨桂生袁海霞
Owner HEFEI GENIUS NEW MATERIALS
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